when I wasn't on birth control, it was completely wacky. Never knew when it was coming, never knew when it would end... then I went on BC, and it was so pinpointed that it started on the 4th tuesday of the month @ 11 am. Now I'm on depo, and I have no period!
I've had norplant for years. So I'm generally surprised. All though the last few months I've been fairly regular and have had pms to boot. I do believe it's time for a switch in birth control methods.